NASA

Interview with Sean Colgan

I’m really pleased that you agreed to take advantage of this opportunity.  I don’t recall if I have actually met you personally,  but if so, then I apologize for not remembering.

I don’t think so, although you’ve certainly signed things for me.

Well, I guess I have because I do remember seeing your name from time to time on various things. You’ve been at Ames a long time and we’ll have you talk about that in a little bit. The focus of these interviews is not specifically on your work. In fact, it was intended to broaden people’s understanding of who you are and what you do when you’re not at work, because we get compartmentalized and mostly get to know people through our work interactions, so we’ll be touching on your other interests. As you’ve seen if you’ve read some of these, we generally start with your childhood. I try to look up bios and things like that ahead of time to see what I can glean before these interviews but you don’t have a very substantial presence on the web.

I’m not a very public person.

I did find that out (laughs).

I did not volunteer for these and I tried to lay low until you hunted me down! (laughs)

Well, I think you’ll be pleased and as I said, you can stay as private as you want during this whole interview.

Sounds good.

We like to start with where you were born, your family at the time, what your parents did, if you have siblings, and then we ask when became aware of or developed an interest in what you have pursued as a career.

OK, and I’m going to be looking sideways at my notes because I printed out your list of questions and thought about them. Hopefully I won’t mess it up too much. I’m a big believer in the written word. I was born in Oakland, just up the Bay.

So was I, so we have a connection right there!

Up through my preteen years I grew up split between Oakland and North Lake Tahoe. My dad was a masonry contractor. When school got out in June we would go up to Tahoe where there was lots of work for him, building foundations for homes and so forth. When Christmas break came in school, we came back down to Oakland. We had a home in both places and dad could get work in the winter in the Bay Area. In the middle of every year during my preteen years, I switched between two schools. It was usually a bit of a jolt because the Oakland schools were ahead of the Tahoe schools, so there were a couple weeks of flailing about in January trying to catch up. They all used the same textbooks, but we were a couple of chapters behind at that point and had to catch up.

When I was 12, Dad had established his business well enough at Tahoe that my parents sold both of the houses, built a somewhat bigger one, and we moved to Tahoe permanently. So from seventh grade through high school it was all at the northern end of Lake Tahoe.

I have one sibling, a brother.

And when did I start thinking about becoming an astronomer? I can’t remember exactly, to be perfectly honest. I do remember my parents showing me the constellations. I can remember specifically which constellations my dad showed me and which ones my mom showed me. I can’t remember a time when I wasn’t interested primarily in being an astronomer, but I probably went through an astronaut phase because it was the ‘60’s!  I got an astronomy book for my birthday one year and I know it was before I could really read and understand it. I remember looking at the pictures. In thinking about this interview, I went back and looked.  That book was published when I was five, so probably by the time I was five I was talking about it enough that I got this book for my birthday. I don’t have any similar books on other topics from that time. All the other books I have from back then are astronomy books for kids.

Well, you were living in Lake Tahoe, which by the elevation and the clarity and lack of ambient lights around you would have had a really good view of the stars and constellations.

Right. It was great. Although before we moved up there full time we were mostly there in the summer, so it didn’t get dark until after my bedtime.  When we moved up there full time, then I could go out in the winter and yeah, we had a spectacular view of the southern sky. There were woods but we could see over the trees. We could see the center of the Milky Way, and so forth. I had binoculars and a couple of small telescopes that I’d use, along with a star atlas to point me toward interesting things to look at.

Did you say what your mother did? Did she work outside the home?

Mom was a writer.  We traveled each year when we were growing up. She would write travelogues of those trips and try to get them published. She also wrote haiku poetry, and she tried her hand at writing other things. She was published a bit, but not a whole lot. Mom did get one of her travelogues published in the Christian Science Monitor. That was a highlight for her.

And was your brother older or younger?

My brother is two years younger, and we had somewhat similar trajectories.  We’ll get to education later but he majored in physics as well. He followed me in similar universities, but ended up going into material sciences. He is now on the East Coast working for IBM.

That’s great.

He was named a Master Inventor in 2018.

A what?

A Master Inventor. He has over 200 patents, so IBM honored him with this title.

That’s quite an honor!  Your education was interesting because of the split between the two schools.  But then at some point, when you went to college, you had to declare a major. You said you had already developed an interest in astronomy, so did you pursue that science discipline right off the bat?

I went to UC Riverside for two years, and then I transferred to Caltech. My freshman year  I really nailed down my choice for astronomy. I remember going to the Career Center and taking an interest survey, which has nothing to do with what you’re able to do. It just asks what you’re interested in doing, and it came up as physicist or musician.  I have no musical skills so that pointed me in the other direction. I thought briefly about geology, since my dad had been a geology major, but I really settled on astronomy at that point, which is why I transferred. Riverside didn’t have an astronomy major,  they only had a physics major. I really wanted to get an astronomy background and start on it early.

My time at Caltech was probably the toughest two years I’ve ever had. I was behind because I had gone to Riverside for two years and the Caltech student body was extremely competitive. Caltech was not generous with their transfer credits. I ended up taking a very heavy course load, but I did make it out in two years. From there I applied to a number of grad schools. I settled on Cornell for a couple reasons: First of all because they had groups working in the areas  of astronomy I thought I was interested in, which were radio and infrared. Second of all, after four years in southern California I really wanted to go to a more rural setting to continue my education.

I have to ask this because when we’ve interviewed others who have gone to Cornell, most of them have mentioned the influence of Carl Sagan and I just wondered if that figured into your choice, or was he gone by the time you went there?

Well, I  did meet Carl, at a second year reception he threw for the grad students.  He was gone most of my first year working on Cosmos the television show. He had taken a leave of absence and wasn’t around. When he came back he threw a reception for all of us, and I got to shake his hand. He was a planetary scientist, of course, and that was not where I was aiming my trajectory.  I didn’t see him a whole lot other than that one reception. Although from time to time the kind of people you really don’t want wandering around the halls would come around the building looking for Carl Sagan. Security would chase them down and get them out. These are really my most distinct memories of Carl.

And your PhD was in astronomy, not physics?

It was in astronomy and my dissertation was on radio astronomy. I did it almost exclusively at Arecibo (Arecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, Puerto Rico) with a little bit at the VLA (Very Large Array Radio Telescope facility, near Socorro, New Mexico). I got to work with some really smart people at Cornell, observational and theoretical.

At this point we usually inquire about the connection or the influence, that brought you from your PhD to NASA Ames.

My degree was in radio astronomy but the other interest I always had along the way, which I hadn’t been able to look into, was infrared astronomy. Getting post docs is very competitive, back then we called them NRC’s. The NRC offer from Ed Erickson’s group at Ames was the best offer, so I came out for that. It wasn’t a sure thing, there was back and forth and the highest rated candidate had to turn down the job before they would make me an offer.  But fortunately for me the highest rated candidate was my office mate at Cornell. I knew he was going to turn down the offer as soon as he got another one he wanted, so I was aware a little bit in advance of getting the call from Ed that things had worked out.

And Ed was your advisor?

Ed was my advisor. So I came and did two years as an NRC and then continued working with the group. I had made myself sufficiently useful that when I was ready to apply for other jobs, Ed offered me a raise if I’d stay with the group and continue working. That was a really good time. We flew on the KAO (Kuiper Airborne Observatory). They didn’t really have facility instruments, so we had our own instrument, but we did support observers from outside our group. We probably had more flights than any other instrument on the KAO during that period. It was a lot of flights. We had to operate it ourselves. All of us had our own particular jobs on flights. We did everything from prepping for the observations, writing proposals, all the way through to seeing them published. We were a small team: Ed Erickson, Mike Haas; Jan Simpson, and Bob Rubin on the science side helped out. We had a shop guy, Gene Beckstrom, and others after him.  We had a lab technician, Jim Baltz. Dave Hollenbach would also work with us, and that was very rewarding. He was a very sharp guy in terms of theory, ideas and projects to do. Here is a photo of some of us with our instrument rack getting ready for a KAO flight:

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